Clicking already selected topic does not open the message list

[Schmiddiii]

When on a mobile layout (i.e. the NavigationSplitView is collapsed) and on the "Topics" page, clicking the already activated topic does not open the "Notifications" page.

To fix this, I think you need to switch out connect_row_selected with connect_activate here, and set single_click_activate of your subscription_list to true.